Thermal energy storage materials

a technology of energy storage materials and materials, applied in the direction of stationary plate conduit assemblies, indirect heat exchangers, lighting and heating apparatus, etc., can solve the problems of complex effort to apply tesms in commercial applications, complex assembly of such tesms into functionally operative systems, and inability to achieve satisfactory service performance, etc., to achieve the effect of improving performan

Inactive Publication Date: 2009-08-27
DOW GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0008]The present invention meets some or all of the above needs by providing an improved TESM system that reliably and reproducibly stores and recovers latent heat comprising: a container having a wall surface; and a TESM in at least partial contact with the wall surface, and including: i) at least one first metal containing material including at least one first metal compound that includes a nitrate ion, a nitrite ion, or both; ii) at least one second metal containing material including at least one second metal compound; and iii) optionally including water, wherein the water concentration if any is present is less than about 10 wt. %; wherein the TESM has a liquidus temperature, TL, from about 100° C. to about 250° C.; and wherein the TESM exhibits a heat storage density from 300° C. to 80° C. of at least about 1 MJ/l; so that upon being used in a system that generates heat, at least a portion of the heat is captured and stored by the TESM and subsequently released for use, and wherein the absolute value of the change in mass of the wall surface in contact with the TESM is less than about 1 g per m2 of the wall surface after 45 days exposure to the TESM at 300° C. in an inert atmosphere.
[0009]The TESM system may include a TESM according to the present teachings in a container (e.g., a capsule), optionally b...

Problems solved by technology

Heretofore, efforts to apply TESMs in commercial applications have also been complicated by difficulties in achieving satisfactory performance in service.
Though a TESM may be known to have certain attributes to qualify it as a heat storage material, the assembly of such TESMs into a functionally operative system has been complicated by the unpredictability of the materials and other considerations, such as TESM interactions in service with other system materials.
Many materials known to be phase change materials are also corrosive in many environments.
It may also prove d...

Method used

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Examples

Experimental program
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example 1

[0089]A 5 g mixture containing 40 mole % of powdered lithium nitrate and 60 mole % of powdered lithium hydroxide is prepared by first mixing wet grinding and mixing the two anhydrous salts with a mortar and pestle in acetone. The acetone slurry is then poured into a fused silica crucible with a fused silica lid, both lined with aluminum foil. After vacuum drying at room temperature to remove the acetone, the crucibles are placed in a furnace and heated from room temperature to 300° C. at a rate of 5° C. / min. The samples are held at 300° C. for 1 hour. While at the elevated temperature, the samples are stirred about every 5 minutes by shaking the entire furnace. These binary mixtures of lithium nitrate and lithium hydroxide are then cooled to room temperature. The liquidus temperature and the heat storage density from 300° C. to 80° C. of these samples is then measured. The heat storage density (HSD300,80) is greater than 1.4 MJ / l and the liquidus temperature is about 190° C.

example 2

[0090]A 5 g mixture of 85 mole % lithium nitrate and 15 mole % of an eutectic mixture of a mixed metal fluoride salt containing MgF2, NaF, and LiF (having a ratio of MgF2:NaF:LiF of about 10:43:47 and a eutectic transition temperature of about 630° C.) is prepared in a manner similar to Example 1. To homogenize the metal salts, a furnace is heated to 500° C. at 5° C. / min, and is then held for 1 hour at 500° C. The mixed metal fluoride dissolves in the molten lithium nitrate under these conditions. The sample is then cooled to room temperature. The sample is polished in order to perform optical microscopy studies of the structure and for compositional analysis using electron microscopy. The liquidus temperature and the heat storage density from 300° C. to 80° C. of these samples is then measured. The heat storage density (HSD300,80) is greater than 1.6 MJ / l and the liquidus temperature is about 196° C.

example 3

[0091]A 5 g mixture of 85 mole % lithium nitrate and 15 mole % of an eutectic mixture of a mixed metal salt containing NaCl, NaF, and LiF (having a ratio of NaCl:NaF:LiF of about 24:36:40 and a eutectic transition temperature of 582° C.) is prepared in a manner similar to Example 2. After homogenizing at 500° C. for 1 hour and cooling to room temperature this sample is polished in order to perform optical microscopy studies of the structure and for compositional analysis using electron microscopy. The liquidus temperature and the heat storage density from 300° C. to 80° C. of these samples is then measured. The heat storage density (HSD300,80) is greater than 1.4 MJ / l and the liquidus temperature is about 250° C.

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Abstract

A thermal energy storage material (TESM) system (and associated methods) that reproducibly stores and recovers latent heat comprising i) at least one first metal containing material including at least one first metal compound that includes a nitrate ion, a nitrite ion, or both; ii) at least one second metal containing material including at least one second metal compound; and iii) optionally including water, wherein the water concentration if any is present is less than about 10 wt. %; wherein the TESM has a liquidus temperature, TL, from about 100° C. to about 250° C.; and wherein the TESM exhibits a heat storage density from 300° C. to 80° C. of at least about 1 MJ/l; so that upon being used in a system that generates heat, at least a portion of the heat is captured and stored by the TESM and subsequently released for use, and the system is generally resistant to corrosion at temperatures of about 300° C.

Description

CLAIM OF PRIORITY[0001]The present application claims the benefit of the filing dates of U.S. Provisional Patent Application Ser. Nos. 61 / 030,755 (filed Feb. 22, 2008); 61 / 061,908 (filed Jun. 16, 2008); 61 / 074,799 (filed Jun. 23, 2008); 61 / 074,840 (filed Jun. 23, 2008); 61 / 074,869 (filed Jun. 23, 2008); 61 / 074,889 (filed Jun. 23, 2008); and 61 / 090,084 (filed Aug. 19, 2008), and U.S. patent application Ser. No. ______ entitled “HEAT STORAGE DEVICES” filed on Feb. 20, 2009 (attorney docket number 67170B (1062-091)), the contents of which are hereby incorporated by reference in their entirety.FIELD OF THE INVENTION[0002]The present invention relates to thermal energy storage materials (TESMs), and in one particular aspect, to improved TESM chemical compositions.BACKGROUND OF THE INVENTION[0003]Thermal energy storage materials (TESMs) are known and have been used in applications for storing heat for subsequent use. Many TESMs are phase change materials, meaning they undergo a phase chan...

Claims

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Application Information

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IPC IPC(8): F28D20/00B21D53/02
CPCC09K5/063F24H7/02F28D9/0031F28D20/021Y10T29/49357F28F9/026Y02E60/145F28F2240/00F28D2020/0008Y02E60/14
Inventor BANK, DAVID H.SOUKHOJAK, ANDREY N.SEHANOBISH, KALYANMCLEOD, DAVID G.
Owner DOW GLOBAL TECH LLC
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